Evaporator



Jan. 4, 1944. Q T, ASHBY 2,338,277

EVAPORATOR Filed Sept. 20, 1941v INVENTQR ATTORNEY Patented Jan. 4, 1944 EVAPORATOR Carl 'l'. Ashby, Evansville, Ind., assignor to Servei,

Inc., New York, N. Y., a corporation of Dela- VAmmann. september zo, 1941,. serial No. 411,625 s claims. (c1. sz-izs) My invention relates to refrigeration and more particularly to an evaporator. particularly for diffusion type absorption refrigeration apparatus.

It is an object of the invention to provide an evaporator formed of steel tubing and having shelves in good thermal contact with the tubing.

The drawing shows in'Fig. 1 a front elevation of an evaporator embodying the invention. a part of the front being broken away to better show the structure; and in Fig. 2, a fragmentary vertical view, in section, of the evaporator in Fig. 1 to illustrate more clearly the evaporator construction.

The evaporator comprises tubing including a plurality of generally horizontal U-shape sections lli connected by vertical bends. This type of evaporator is shown and described, for instance, in Patent 2,008,343 to A. R. Thomas.

The two upper bends are provided with heat transfer ns il. The lower bends are enclosed in a sheet metal casing I2. The casing I2 is provided with a front plate Il having openings Il which` provide access to the interior to the casing i2 for inserting and removing ice freezing trays or the like.

On each of the U-bends within the casing I2 there is secured a shelf forming plate l5. Each plate l5 is substantially fiat and has its side edges turned downward overthe tubing I as probably best seen in Fig. 2. In accordance with my invention, the steel tubing l0 is coated with aluminum. 'I'he shelf plates l5, and if desired, the fins Il v are of aluminum. In fabrication of the evaporator, the tubing I0 is first formed into the described shape and coated with aluminum. Then the aluminum shelf plates i are placed in posi- 5 tion and the whole placed in a welding furnace f in which fusion of the aluminum coating and shelf plate takes' place, providing an improved thermal bond between the shelf and the tubing. Various changes and modifications may be made within the scope of the invention as set forth in the following claims.

What is claimed is: 1. An evaporator for refrigeration apparatus comprising an iron conduit coated on the outside with aluminum, and a shelf plate having an aluminum surface attached to said conduit by fusion of said aluminum coating and surface.

2. An evaporator for refrigeration apparatus comprising a substantially horizontal loop of iron tubing, a coating of aluminum on the outside of said tubing. and a shelf plate having an aluminum surface resting on said loop and thermally bonded thereto by fusion of said aluminum coating and surface.

"3. An evaporator' for refrigeration apparatus comprising an iron pipe, Va coating of aluminum on the outside of said pipe, and an aluminum plate secured to said pipe by fusion of said aluminum coating and plate. 30 CARL T. ASHBY. 

